Stay bolt structure for interconnecting structural parts



Nov. 9, 1965 F. BLlNN 3,216,540

STAY BOLT STRUCTURE FOR INTERCONNEGTING STRUCTURAL PARTS Original FiledOct. 5, 1959 2 Sheets-Sheet 1 Nov. 9, 1965 F. BLINN STAY BOLT STRUCTUREFOR INTERCONNECTING STRUCTURAL PARTS Original Filed Oct. 5, 1959 2Sheets-Sheet 2 F/Ci 34 23 V 1\ i i as a 2g 3 t ill m l i l'NVFA/WPFPA/VZBl/lV/V United States Patent 3,216,540 STAY BOLT STRUCTURE FGRINTERCONNECT- ENG STRUCTURAL PARTS Franz Blinn, St. Ingbert, Saar,Germany, assignor to Ver- Waltungsgesellschaft Mueller & Neumann 0.H.G.,St. lnghert, Saar, Germany Original application Oct. 5, 1959, Ser. No.844,229, new Patent No. 3,130,628, dated Apr. 28, 1964. Divided and thisapplication Feb. 28, 1964, Ser. No. 350,630

5 Claims. (Cl. 18936) This invention relates to the interconnection ofstructural parts and more particularly to a stay bolt structure forinterconnecting such parts, this structure including hydraulic means forelongating the stay bolt and this application is a division of myco-pending application Serial No. 844,229, filed October 5, 1959, nowPatent 3,130,628.

While the stay bolt structure of this invention is of general utility,the same is primarily intended for interconnecting the roll mounts offrameless rolling mills and for purposes of illustration and not by wayof limitation, the invention will be described in connection with aframe less rolling mill.

Various types of stay bolt structure have heretofore been utilized forinterconnecting the roll mounts of frameless rolling mills and for otherpurposes and such stay bolts have also included hydraulic means forelongating the same in order to permit convenient adjustment and thisinvention constitutes an improvement over the presently known types ofstay bolt structure incorporating hydraulic means for elongating thesame.

It is accordingly an object of the invention to provide a stay boltstructure for interconnecting structural parts and including hydraulicmeans for elongating the stay bolt to facilitate the making ofadjustments.

A further object of the invention is the provision of a stay boltstructure for interconnecting structural parts and including hydraulicmeans for elongating the stay bolt, such stay bolt structure including asingle bolt member extending to the parts to be interconnected and witha portion of the hydraulic means being incorporated in one of theinterconnected parts.

A still further object of the invention is the provision of a stay boltstructure for interconnecting structural parts, such stay bolt structureincluding a single one-piece bolt extending through the parts to beinter-connected with an abutment on one end of the bolt engaging one ofthe parts and with an adjustable nut on the other end of the boltengaging the other part and including hydraulic means for elongating thebolt to permit free movement of one of the parts and adjustment of thenut on the bolt with respect thereto.

Further objects and advantages of the invention will be apparent fromthe following description taken in conjunction with the accompanyingdrawing wherein:

FIG. 1 is a side elevational view with parts broken away and in sectionfor greater clarity and showing a frameless rolling mill incorporatingthe interconnecting stay bolt structure of this invention; and

FIG. 2 is a fragmentary sectional view showing in detail the stay boltstructure structure of this invention.

With continued reference to the drawings and particularly FIG. 1, thereis shown a more or less conventional frameless type rolling mill whichincludes upper and lowor roll mounts 1t) and 11 respectively. Such rollmounts serve to receive and rotatably mount the necks 12 and 13 of rolls14 and 15. It is, of course, understood that similar roll mountingstructure is provided at the opposite ends of the rolls 14 and 15.

The roll necks 12 and 13 are received in suitable roller bearings, notshown, which in turn are mounted in eccentric bearing blocks 16 and 17which are provided with 3,218,549 Patented Nov. 9, 1965 arms 18 and 19for permitting convenient adjustment thereof to provide a fineadjustment between the rolls 14 and 15, Coarse adjustment of the rolls14 and 15 is provided by spacers 20 disposed between the upper and lowerroll mounts 10 and 11 and spacers 20 of different thicknesses may beprovided for varying the spacing between the rolls 14 and 15. Boxes 21and 22 are fixed to the roll necks 12 and 13 respectively and such boxes21 and 22 serve to receive the spindle heads of the roll drive, notshown.

Upper and lower roll mounts 10 and 11 are interconnected by stay boltstructure 23 and in a mill of the type shown in FIG. 1 it will beunderstood that four stay bolts 23 are provided for interconnecting theupper and lower frame mounts. The stay bolt structure 23 forms thesubject matter of this invention and as shown in FIG. 2, the upper rollmount 10 is provided with a bore 24 in alignment with a bore 25 in thelower roll mount 11 and a counterbore 26 is provided in the upperportion of the lower roll mount 11. It is to be noted that the diameterof the counter-bore 26 is the same as the diameter of bore 24 in theupper roll mount 10. It is to be noted that the counter-bore 26 providesa recess 27 opening upwardly toward the upper roll mount 10.

The stay bolt structure includes an elongated bolt member 28 having aportion 29 of enlarged diameter extending through the bore 24 in theupper roll mount 10, through the spacer 20 and slidably received in thecounterbore 26 and a portion 30 of small diameter extends through thebore 25 in the lower roll mount 11. An abutment 31 is fixed to the lowerend of the small diam eter portion 30 of the bolt 28 and the abutment 31engages the lower surface of the lower roll mount 11. While the abutment31 is shown in the drawing as constituting a nut threadedly received onthe threaded end 32 of the lower end of the bolt 28, the abutment 31 maybe secured to the bolt 28 in any desired manner. An adjusting nut 33 isthrcadedly received on the upper end 34 of the enlarged portion 29 ofthe bolt 28 and the adjusting nut 33 engages the upper surface of theupper roll mount 16.

As clearly shown in FIG. 2, the enlarged portion 29 of the bolt 28terminates in a shoulder 35 within the counterbore 26 and the shoulder35 provides a piston disposed in the recess 27. Suitable sealing meansin the form of packing 36 is provided for engaging the enlarged portion29 of the bolt 28 and a similar suitable sealing means in the form of apacking 37 is provided for engaging the small diameter portion 30 of thebolt 28. A passage 38 is provided in the lower roll mount 11communicating with the recess 27 and the passage 38 serves to conductpres sure fluid to the recess 27 in a manner to be presently described.

Again referring to FIG. 1, a suitable pressure fluid accumulator 39 maybe connected through a conduit 40 to a manifold 41. A control valve 42may be provided in the conduit 40 and between the control valve 42 andthe manifold 41 a vent pipe 43 having a valve 44 therein may beconnected to the conduit 40 and the vent pipe 43 may be discharged intoa suitable fluid receiving sump 45. The manifold 41 may be connectedthrough a conduit 46 having a valve 47 therein to one recess 27 in thelower roll mount 11 and the manifold 41 may also be connected throughanother conduit 48 having a valve 49 therein to the other recess 27 inthe lower roll mount 11. It is to be understood that the manifold 41 mayalso be connected to the recesses 27 in the lower roll mount at theopposite end of the rolls in a similar manner to that described above.

When it is desired to elongate all of the stay bolts simultaneously thevalves 47 and 49 are opened, the vent valve 44 closed and the valve 42opened to admit pressure fluid from the accumulator 39 to the conduit 40whereupon such pressure fluid will flow through the manitold 41 and theconduits 46 and 48 to the recesses 27 to act upon the piston formed bythe shoulder 35 on the enlarged portion 29 of the bolt 28 which willserve to stretch the small diameter portion 30 of the bolt 28 therebyraising the adjusting nut 33 above the upper surface of the upper rollmount to permit convenient adjustment of the nut 33 or in the event workhas become jammed between the rolls 14 and 15, the same may be removed.Upon completion of the adjusting operation or the removal of jammedwork, the valve 42 may be closed and the vent valve 44 opened to relievepressure in the recesses 27 thereby permitting the bolt 28 to contractwhich will move the nut 33 into engagement with the upper surface of theupper roll mount 10. Obviously, the pressurefluid circuit shown in FIG.1 may be operated to elongate any one or any combination of the staybolts provided and the stay bolt structure as described above isobviously extremely simple, in that only a single solid bolt member isnecessary and as described above, such bolt structure may be operated tocompletely relieve clamping pressure from the upper roll mount 10.

It will, therefore, be seen that by the above described invention therehas been provided a relatively simple, yet highly effective stay boltstructure for interconnecting structural parts, :such as the upper andlower roll mounts of a rolling mill and in view of the extremesimplicity of the stay bolt structure, the same may be pro- 'vided at arelatively low cost.

It will be obvious to those skilled in the art that various changes maybe made in the invention without departing from the spirit and scopethereof and therefore the invention is not limited by that which isshown in the drawings and described in the specification, but only asindicated in the appended claims.

What is claimed is:

1. A tensioning arrangement for a stay bolt structure interconnectingstructural parts having aligned bores extending therethrough, one ofsaid parts having a counterbore providing a recess opening toward theother part, an elongated bolt member having a portion of enlargeddiameter extending through the bore in said other part and slidablyreceived in said recess and a portion of small diameter extendingthrough the bore in said one part, an abutment on said small diameterportion engaging said one part, a nut threadedly received on saidenlarged diameter portion engaging said other part, said portion ofenlarged diameter terminating in a shoulder within said recess toprovide a piston, sealing means engaging said portion of enlargeddiameter, sealing means engaging said portion of small diameter and apassage in said one part communicating with said recess adjacent theinner end thereof for conducting pressure fluid thereto, whereby uponthe introduction of pressure fluid to said recess a force will beexerted on said piston to stretch said bolt member, thereby relievingthe interconnecting force on-said parts and permitting free adjustmentof said nut on said bolt member.

2. A tensioning arrangement for a stay bolt structure as defined inclaim 1, in which said abutment comprises a nut threadedly received onthe small diameter portion of said bolt member.

3. A tensioning arrangement for a stay bolt structure interconnectingstructural parts having aligned bores extending therethrough, one ofsaid parts having a counterbore providing a recess opening toward theother part, an elongated bolt member having a portion of enlargeddiameter extending through the bore in said other part and slidablyreceived in said recess and a portion of small diameter extendingthrough the bore in said one part, an abutment on said small diameterportion engaging said one part, a nut threadcdly received on saidenlarged diameter portion engaging said other part, said portion ofenlarged diameter terminating in a shoulder within said recess toprovide a piston and a passage in said one part communicating with saidrecess adjacent the inner end thereof for conducting pressure fluidthereto whereby upon the introduction of pressure fluid to said recess aforce will be exerted on said piston to stretch said bolt member,thereby relieving the interconnecting force on said parts and permittingfree adjustment of said nut on said bolt member.

4. A tensioning arrangement for a stay bolt structure interconnectingstructural parts having aligned bores extending therethrough, one ofsaid parts having a counterbore providing a recess opening toward theother part, an elongated bolt member having a portion of enlargeddiameter extending through the bore in said other part and slidablyreceived in said recess and a portion of small diameter extendingthrough the bore in said one part, means connecting said small diameterportion to said one part, a nut threadedly received on said enlargeddiameter portion engaging said other part, said portion of enlargeddiameter terminating in a shoulder within said recess to provide apiston and a passage in said one part communicating with said recessadjacent the inner end thereof for conducting pressure fluid thereto,whereby upon the introduction of pressure fluid to said recess a forcewill be exerted on said piston to stretch said bolt member, therebyrelieving the interconnecting force on said parts and permitting freeadjustment of said nut on said bolt member.

5. A tensioning arrangement for a stay bolt structure interconnectingstructural parts having aligned bores ex tending therethrough, one ofsaid parts having a counterbore providing a recess opening toward theother part, an elongated bolt member having a portion of enlargeddiameter extending through the bore in said other part and slidablyreceived in said recess and a portion of small diameter extendingthrough the bore in said one part, means connecting said small diameterportion to said one part, means on said enlarged diameter portionengaging said other part, said portion of enlarged diameter terminatingin a shoulder within said recess to provide a piston and a passage insaid one part communicating with said recess adjacent the inner endthereof for conducting pressure fluid thereto, whereby upon theintroduction of pressure fluid to said recess a force will be exerted onsaid piston to stretch said bolt member, thereby relieving theinterconnecting force on said parts.

References Cited by the Examiner UNITED STATES PATENTS 2,571,265 10/51Leufven -32 FOREIGN PATENTS 541,58 r 12/41 Great Britain.

RICHARD W. COOKE, JR, Primary Examiner.

FRANK L. ABBOTT, Examiner.

5. A TENSIONING ARRANGEMENT FOR A STAY BOLT STRUCTURE INTERCONNECTINGSTRUCTURAL PARTS HAVING ALIGNED BORES EXTENDING THERETHROUGH, ONE OFSAID PARTS HAVING A COUNTERBORE PROVIDING A RECESS OPENING TOWARD THEOTHER PART, AN ELONGATED BOLT MEMBER HAVING A PORTION OF ENLARGEDDIAMETER EXTENDING THROUGH THE BORE IN SAID OTHER PART AND SLIDABLYRECEIVED IN SAID RECESS AND A PORTION OF SMALL DIAMETER EXTENDINGTHROUGH THE BORE IN SAID ONE PART, MEANS CONNECTING SAID SMALL DIAMETERPORTION TO SAID ONE PART, MEANS ON SAID ENLARGED DIAMETER PORTIONENGAGING SAID OTHER PART, SAID PORTION OF ENLARGED DIAMETER TERMINATINGIN A SHOULDER WITHIN SAID RECESS TO PROVIDE A PISTON AND A PASSAGE INSAID ONE PART COMMUNICATING WITH SAID RECESS ADJACENT THE INNER ENDTHEREOF FOR CONDUCTING PRESSURE FLUID THERETO, WHEREBY UPON THEINTRODUCTION OF PRESSURE FLUID TO SAID RECESS A FORCE WILL BE EXERTED ONSAID PISTON TO STRETCH SAID BOLT MEMBER, THERBEY RELIEVING THEINTERCONNECTING FORCE ON SAID PARTS.